could you help me please.

Let the continuous random variable X denote the distance in micrometers from the start of a track on a magnetic disk until the first flaw. Historical data show that the distribution of X can be modeled by a pdf: f (x) = 500 x > 0 Find the CDF. OF(x) = 1-e300 OF(x) = e-500x OF(x) = e 300 OF (x) = ex